US20020177284A1 - Method of using sacrificial spacers to reduce short channel effect - Google Patents
Method of using sacrificial spacers to reduce short channel effect Download PDFInfo
- Publication number
- US20020177284A1 US20020177284A1 US10/154,281 US15428102A US2002177284A1 US 20020177284 A1 US20020177284 A1 US 20020177284A1 US 15428102 A US15428102 A US 15428102A US 2002177284 A1 US2002177284 A1 US 2002177284A1
- Authority
- US
- United States
- Prior art keywords
- gate electrode
- electrode stack
- spacers
- oxide layer
- sacrificial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000000694 effects Effects 0.000 title description 3
- 239000000758 substrate Substances 0.000 claims abstract description 36
- 239000007943 implant Substances 0.000 claims abstract description 28
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 11
- 239000004065 semiconductor Substances 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 150000002500 ions Chemical class 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 10
- 229910052814 silicon oxide Inorganic materials 0.000 claims 10
- 229910052581 Si3N4 Inorganic materials 0.000 claims 4
- 238000000059 patterning Methods 0.000 claims 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims 4
- 150000004767 nitrides Chemical class 0.000 claims 3
- 239000010410 layer Substances 0.000 description 29
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/6653—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using the removal of at least part of spacer, e.g. disposable spacer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/6656—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using multiple spacer layers, e.g. multiple sidewall spacers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66575—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate
- H01L29/6659—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate with both lightly doped source and drain extensions and source and drain self-aligned to the sides of the gate, e.g. lightly doped drain [LDD] MOSFET, double diffused drain [DDD] MOSFET
Definitions
- U.S. Pat. No. 5,863,824 to Gardner et al. describes a method of forming semiconductor devices using gate electrode length and spacer width for controlling drive current strength.
- U.S. Pat. No. 5,846,857 to Ju describes a method of manufacturing a CMOS device employing removable sidewall spacers for independently optimized N- and P-channel transistor performance.
- a substrate having a gate electrode stack formed thereover is provided.
- the substrate having an exposed surface and the gate electrode stack including a lower portion with exposed side walls.
- a first oxide layer is formed over: the exposed side walls of the lower portion of the gate electrode stack; and the exposed surface of the substrate.
- LDD implants may then be implanted into the substrate adjacent the first oxide layer formed over the exposed side walls of the lower portion of the gate electrode stack.
- a conformal dielectric layer is formed over the gate electrode stack and the first oxide layer.
- a sacrificial dielectric layer is formed over the conformal dielectric layer.
- the horizontal portions of the sacrificial dielectric layer, the conformal dielectric layer and the underlying portions of the first oxide layer are patterned to form: sacrificial dielectric spacers; L-shaped conformal dielectric spacers thereunder; and L-shaped first oxide layer spacers thereunder. Then, using the gate electrode stack and the sacrificial dielectric spacers as masks, source/drain implants are implanted adjacent the sacrificial dielectric spacers and the sacrificial dielectric spacers are removed.
- nitride spacers are formed with the L-shaped first oxide spacers with sacrificial oxide spacers being formed over the nitride spacers before formation of the source/drain implants.
- FIGS. 1 and 2 schematically illustrate a process common to both preferred embodiments of the present invention.
- FIGS. 3 to 5 schematically illustrate a first preferred embodiment of the present invention in conjunction with FIGS. 1 and 2.
- FIGS. 6 to 9 schematically illustrate a second preferred embodiment of the present invention in conjunction with FIGS. 1 and 2.
- FIG. 1 illustrates a substrate 10 having at least one gate electrode stack 18 formed thereover. Adjacent gate electrode stacks 18 may be separated by an isolation structure 12 . Gate electrode stack 18 has an underlying gate oxide layer 14 , an intermediate polycide portion 16 with exposed side walls 9 and an overlying SiN cap 23 .
- Structure 10 is preferably a silicon or germanium substrate and isolation structure 12 is preferably a shallow trench isolation (STI) structure.
- STI shallow trench isolation
- an oxide layer 19 is thermally grown over the exposed side walls 9 of polycide portion 16 and over the exposed surface of substrate 10 , covering the exposed side walls of gate oxide layer 14 , to form initial sidewall spacers 20 over gate electrode stack 18 .
- Initial oxide spacers 20 have a lower base width 21 of preferably from about 70 to 150 ⁇ and more preferably from about 80 to 130 ⁇ .
- Initial oxide spacers 20 serve as barriers to prevent/mitigate damage otherwise caused by subsequent implantations.
- LDD implants 22 are formed through the horizontal portions of oxide layer 19 and into substrate 10 adjacent initial oxide spacers 20 to a depth of preferably from about 300 to 1500 ⁇ and more preferably from about 500 to 1200 ⁇ .
- BF 2 , P or As ions are preferably used to form LDD implants 22 and are preferably at a energy of preferably from about 5 to 45 keV.
- a conformal SiN dielectric layer 100 is formed over gate electrode stack 18 , initial oxide spacers 20 , the horizontal portions of oxide layer 19 and STI 12 .
- a sacrificial oxide layer 102 is then formed over conformal SiN layer 100 .
- Conformal sacrificial oxide layer 102 is preferably comprised of chemical vapor deposition (CVD) oxide (SiO 2 ).
- a conventional photolithography and etch process is performed to remove: the horizontal portions of sacrificial oxide layer 102 to form sacrificial oxide spacers 26 having a lower base width of preferably from about 80 to 300 ⁇ and more preferably from about 100 to 200 ⁇ ; the underlying portions of conformal SiN layer 100 to form initial L-shaped SiN spacers 28 (leaving a portion of SIN layer 100 over SiN cap 23 ); and the underlying horizontal portions of oxide layer 19 to complete formation of L-shaped oxide spacers 27 .
- source/drain (S/D) implants 29 are formed within substrate 10 adjacent sacrificial oxide spacers 26 to a depth of preferably from about 500 to 2000 ⁇ and more preferably from about 800 to 1500 ⁇ .
- BF 2 , P or As ions are preferably used to form S/D implants 29 and are preferably used at an energy of preferably from about 5 to 50 keV.
- the portion of SiN layer 100 overlying SiN cap 23 is removed to form the final SiN spacers 28 and sacrificial oxide spacers 26 are removed preferably using a wet clean process with chemical HF to complete the structure of the first embodiment.
- the effective gate length will become wider due to a sacrificial oxide spacer and in the same time without loss of gap fill for the following interlayer dielectric film. It does not change aspect ratio of gate stack to space as well.
- a conformal SiN dielectric layer 200 is formed over gate electrode stack 18 , initial oxide spacers 20 , the horizontal portions of oxide layer 19 and STI 12 .
- the conformal SiN dielectric layer 200 is patterned with the underlying horizontal portions of oxide layer 19 to form: SiN spacers 201 ; and thus L-shaped oxide spacers 202 .
- Nitride spacers 201 have a lower base width of preferably from about 150 to 500 ⁇ and more preferably from about 200 to 400 ⁇ .
- sacrificial oxide (SiO 2 ) spacers 204 are formed over nitride spacers 201 .
- Sacrificial oxide spacers 204 are more preferably formed of CVD oxide (SiO 2 ).
- Sacrificial oxide spacers 204 have a lower base width of preferably from about 80 to 300 ⁇ and more preferably from about 100 to 200 ⁇ .
- source/drain (S/D) implants 206 are formed within substrate 10 adjacent sacrificial oxide spacers 204 to a depth of preferably from about 500 to 2000 ⁇ and more preferably from about 800 to 1500 ⁇ .
- BF 2 , P or As ions are preferably used to form S/D implants 54 and preferably used at an energy of preferably from about 5 to 50 keV.
- sacrificial oxide spacers 204 are removed from nitride spacers 201 preferably using a wet clean process with chemical HF to complete the structure of the second embodiment.
- the effective gate length will become wider due to a sacrificial oxide spacer and in the same time without loss of gap fill for the following interlayer dielectric film. It does not change aspect ratio of gate stack to space as well.
- the advantages of one or more embodiments of the present invention include effectively broadening the channel length without suffering the aspect ratio.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Abstract
A method of forming a semiconductor device comprising the following sequential steps. A substrate having a gate electrode stack formed thereover is provided. The substrate having an exposed surface and the gate electrode stack including a lower portion with exposed side walls. A first oxide layer is formed over: the exposed side walls of the lower portion of the gate electrode stack; and the exposed surface of the substrate. A conformal dielectric layer is formed over the gate electrode stack and the first oxide layer. A sacrificial dielectric layer is formed over the conformal dielectric layer. The horizontal portions of the sacrificial dielectric layer, the conformal dielectric layer and the underlying portions of the first oxide layer are patterned to form: sacrificial dielectric spacers; L-shaped conformal dielectric spacers thereunder; and L-shaped first oxide layer spacers thereunder. Then, using the gate electrode stack and the sacrificial dielectric spacers as masks, source/drain implants are implanted adjacent the sacrificial dielectric spacers and the sacrificial dielectric spacers are removed. In an alternate embodiment, nitride spacers are formed with the L-shaped first oxide spacers with sacrificial oxide spacers being formed over the nitride spacers before formation of the source/drain implants.
Description
- As semiconductor devices become smaller and smaller, the devices, such as transistors, suffer severe short channel effect.
- U.S. Pat. No. 5,863,824 to Gardner et al. describes a method of forming semiconductor devices using gate electrode length and spacer width for controlling drive current strength.
- U.S. Pat. No. 5,846,857 to Ju describes a method of manufacturing a CMOS device employing removable sidewall spacers for independently optimized N- and P-channel transistor performance.
- U.S. Pat. No. 6,156,598 to Zhou et al. describes a dual spacer process.
- U.S. Pat. No. 5,789,298 to Gardner et al. describes another dual spacer process.
- Accordingly, it is an object of one or more embodiments of the present invention to provide an improved method of forming semiconductor devices while minimizing short channel effect.
- Other objects will appear hereinafter.
- It has now been discovered that the above and other objects of the present invention may be accomplished in the following manner. Specifically, a substrate having a gate electrode stack formed thereover is provided. The substrate having an exposed surface and the gate electrode stack including a lower portion with exposed side walls. A first oxide layer is formed over: the exposed side walls of the lower portion of the gate electrode stack; and the exposed surface of the substrate. LDD implants may then be implanted into the substrate adjacent the first oxide layer formed over the exposed side walls of the lower portion of the gate electrode stack. A conformal dielectric layer is formed over the gate electrode stack and the first oxide layer. A sacrificial dielectric layer is formed over the conformal dielectric layer. The horizontal portions of the sacrificial dielectric layer, the conformal dielectric layer and the underlying portions of the first oxide layer are patterned to form: sacrificial dielectric spacers; L-shaped conformal dielectric spacers thereunder; and L-shaped first oxide layer spacers thereunder. Then, using the gate electrode stack and the sacrificial dielectric spacers as masks, source/drain implants are implanted adjacent the sacrificial dielectric spacers and the sacrificial dielectric spacers are removed. In an alternate embodiment, nitride spacers are formed with the L-shaped first oxide spacers with sacrificial oxide spacers being formed over the nitride spacers before formation of the source/drain implants.
- The present invention will be more clearly understood from the following description taken in conjunction with the accompanying drawings in which like reference numerals designate similar or corresponding elements, regions and portions and in which:
- FIGS. 1 and 2 schematically illustrate a process common to both preferred embodiments of the present invention.
- FIGS.3 to 5 schematically illustrate a first preferred embodiment of the present invention in conjunction with FIGS. 1 and 2.
- FIGS.6 to 9 schematically illustrate a second preferred embodiment of the present invention in conjunction with FIGS. 1 and 2.
- Figures Common to Both Embodiments (FIGS. 1 and 2)
- Initial Structure
- FIG. 1 illustrates a
substrate 10 having at least onegate electrode stack 18 formed thereover. Adjacentgate electrode stacks 18 may be separated by anisolation structure 12.Gate electrode stack 18 has an underlyinggate oxide layer 14, anintermediate polycide portion 16 with exposedside walls 9 and anoverlying SiN cap 23. -
Structure 10 is preferably a silicon or germanium substrate andisolation structure 12 is preferably a shallow trench isolation (STI) structure. - Formation of
Initial Oxide Spacers 20 - As shown in FIG. 1, an
oxide layer 19 is thermally grown over the exposedside walls 9 ofpolycide portion 16 and over the exposed surface ofsubstrate 10, covering the exposed side walls ofgate oxide layer 14, to forminitial sidewall spacers 20 overgate electrode stack 18. -
Initial oxide spacers 20 have alower base width 21 of preferably from about 70 to 150 Å and more preferably from about 80 to 130 Å. -
Initial oxide spacers 20 serve as barriers to prevent/mitigate damage otherwise caused by subsequent implantations. - Formation of LDD
Implants 22 - As shown in FIG. 2 and using
gate electrode stack 18 and the vertical portions ofinitial oxide spacers 20 as masks,LDD implants 22 are formed through the horizontal portions ofoxide layer 19 and intosubstrate 10 adjacentinitial oxide spacers 20 to a depth of preferably from about 300 to 1500 Å and more preferably from about 500 to 1200 Å. BF2, P or As ions are preferably used to formLDD implants 22 and are preferably at a energy of preferably from about 5 to 45 keV. - First Embodiment—FIGS. (1, 2), and 3 and 5
- Formation of
Sacrificial Oxide Spacers 26, L-Shaped SiNSpacers 28 and L-ShapedOxide Spacers 27 - As shown in FIG. 3, a conformal SiN
dielectric layer 100 is formed overgate electrode stack 18,initial oxide spacers 20, the horizontal portions ofoxide layer 19 andSTI 12. - A
sacrificial oxide layer 102 is then formed overconformal SiN layer 100. Conformalsacrificial oxide layer 102 is preferably comprised of chemical vapor deposition (CVD) oxide (SiO2). - Then, a conventional photolithography and etch process is performed to remove: the horizontal portions of
sacrificial oxide layer 102 to formsacrificial oxide spacers 26 having a lower base width of preferably from about 80 to 300 Å and more preferably from about 100 to 200 Å; the underlying portions ofconformal SiN layer 100 to form initial L-shaped SiN spacers 28 (leaving a portion ofSIN layer 100 over SiN cap 23); and the underlying horizontal portions ofoxide layer 19 to complete formation of L-shaped oxide spacers 27. - Source/Drain (S/D)29 Implantation
- As shown in FIG. 4, using the
gate electrode stack 18 andsacrificial oxide spacers 26 as masks, source/drain (S/D)implants 29 are formed withinsubstrate 10 adjacentsacrificial oxide spacers 26 to a depth of preferably from about 500 to 2000 Å and more preferably from about 800 to 1500 Å. BF2, P or As ions are preferably used to form S/D implants 29 and are preferably used at an energy of preferably from about 5 to 50 keV. - Removal of
Sacrificial Oxide Spacers 26 - As shown in FIG. 5, the portion of
SiN layer 100 overlyingSiN cap 23 is removed to form thefinal SiN spacers 28 andsacrificial oxide spacers 26 are removed preferably using a wet clean process with chemical HF to complete the structure of the first embodiment. - Further processing may then proceed.
- Thus, the effective gate length will become wider due to a sacrificial oxide spacer and in the same time without loss of gap fill for the following interlayer dielectric film. It does not change aspect ratio of gate stack to space as well.
- Second Embodiment—FIGS. (1, 2) and 6 to 9
- Formation of Conformal SiN
Layer 200 - As shown in FIG. 6, a conformal SiN
dielectric layer 200 is formed overgate electrode stack 18,initial oxide spacers 20, the horizontal portions ofoxide layer 19 andSTI 12. - Formation of Nitride
Spacers 201 and L-ShapedOxide Spacers 202 - As shown in FIG. 7, the conformal SiN
dielectric layer 200 is patterned with the underlying horizontal portions ofoxide layer 19 to form:SiN spacers 201; and thus L-shapedoxide spacers 202. - Nitride
spacers 201 have a lower base width of preferably from about 150 to 500 Å and more preferably from about 200 to 400 Å. - Formation of
Sacrificial Oxide Spacers 204 OverNitride Spacers 201 - As shown in FIG. 8, sacrificial oxide (SiO2)
spacers 204 are formed overnitride spacers 201.Sacrificial oxide spacers 204 are more preferably formed of CVD oxide (SiO2).Sacrificial oxide spacers 204 have a lower base width of preferably from about 80 to 300 Å and more preferably from about 100 to 200 Å. - Formation of Source/Drain (S/D)
Implants 206 - As shown in FIG. 8, using
gate electrode stack 18,sacrificial oxide spacers 204 andnitride spacers 201 as masks, source/drain (S/D)implants 206 are formed withinsubstrate 10 adjacentsacrificial oxide spacers 204 to a depth of preferably from about 500 to 2000 Å and more preferably from about 800 to 1500 Å. BF2, P or As ions are preferably used to form S/D implants 54 and preferably used at an energy of preferably from about 5 to 50 keV. - Removal of
Sacrificial Oxide Spacers 204 - As shown in FIG. 9,
sacrificial oxide spacers 204 are removed fromnitride spacers 201 preferably using a wet clean process with chemical HF to complete the structure of the second embodiment. - Further processing may then proceed.
- Thus, the effective gate length will become wider due to a sacrificial oxide spacer and in the same time without loss of gap fill for the following interlayer dielectric film. It does not change aspect ratio of gate stack to space as well.
- Advantages of the Present Invention
- The advantages of one or more embodiments of the present invention include effectively broadening the channel length without suffering the aspect ratio.
- While particular embodiments of the present invention have been illustrated and described, it is not intended to limit the invention, except as defined by the following claims.
Claims (17)
1. A method of forming a semiconductor device, comprising the sequential steps of:
providing a substrate having a gate electrode stack formed thereover; the substrate having an exposed surface; the gate electrode stack including a lower portion with exposed side walls;
forming a first oxide layer over:
the exposed side walls of the lower portion of the gate electrode stack; and
the exposed surface of the substrate;
forming a conformal dielectric layer over the gate electrode stack and the first oxide layer;
forming a sacrificial dielectric layer over the conformal dielectric layer;
patterning the horizontal portions of the sacrificial dielectric layer, the conformal dielectric layer and the underlying portions of the first oxide layer to form:
sacrificial dielectric spacers;
L-shaped conformal dielectric spacers thereunder; and
L-shaped first oxide layer spacers thereunder;
using the gate electrode stack and the sacrificial dielectric spacers as masks, implanting source/drain implants adjacent the sacrificial dielectric spacers; and
removing the sacrificial dielectric spacers.
2. The method of claim 1 , wherein the first oxide layer is comprised of thermal silicon oxide; the conformal dielectric layer is comprised of nitride or silicon nitride; and the sacrificial dielectric layer is comprised of oxide, silicon oxide or CVD silicon oxide.
3. The method of claim 1 , wherein the first oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack has a base width of from about 70 to 150 Å and the sacrificial dielectric spacers have a base width of from about 80 to 300 Å.
4. The method of claim 1 , wherein the source/drain implants are formed within the substrate to a depth of from about 500 to 2000 Å at an energy of from about 5 to 45 KeV and using ions selected from the group consisting of BF2, P and As.
5. The method of claim 1 , including the step of using the gate electrode stack and the first oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack as masks, implanting LDD implants into the silicon substrate adjacent the first thermal layer over the exposed sidewalls of the lower portion of the gate electrode stack before the formation of the conformal dielectric layer.
6. A method of forming a semiconductor device, comprising the sequential steps of:
providing a silicon substrate having a gate electrode stack formed thereover; the silicon substrate having an exposed surface; the gate electrode stack including a lower portion with exposed side walls;
forming a first thermal oxide layer over:
the exposed side walls of the lower portion of the gate electrode stack; and
the exposed surface of the silicon substrate;
using the gate electrode stack and the first thermal oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack as masks, implanting LDD implants into the silicon substrate adjacent the first thermal layer over the exposed sidewalls of the lower portion of the gate electrode stack;
forming a conformal SiN layer over the gate electrode stack and the first thermal oxide layer;
forming a sacrificial oxide layer over the conformal SiN layer;
patterning the horizontal portions of the sacrificial oxide layer, the conformal SiN layer and the underlying portions of the first thermal oxide layer to form:
sacrificial oxide spacers;
L-shaped conformal SiN spacers thereunder; and
L-shaped first thermal oxide layer spacers thereunder;
using the gate electrode stack and the sacrificial oxide spacers as masks, implanting source/drain implants adjacent the sacrificial oxide spacers; and
removing the sacrificial oxide spacers.
7. The method of claim 6 , wherein the first thermal oxide layer is comprised of thermal silicon oxide and the sacrificial oxide layer is comprised of oxide, silicon oxide or CVD silicon oxide.
8. The method of claim 6 , wherein the first thermal oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack has a base width of from about 70 to 150 Å and the sacrificial oxide spacers have a base width of from about 80 to 300 Å.
9. The method of claim 6 , wherein the LDD implants are formed within the silicon substrate to a depth of from about 500 to 2000 Å using ions selected from the group consisting of BF2, P and As; and the source/drain implants are formed within the silicon substrate to a depth of from about 500 to 2000 Å using ions selected from the group consisting of BF2, P and As.
10. A method of forming a semiconductor device, comprising the sequential steps of:
providing a substrate having a gate electrode stack formed thereover; the substrate having an exposed surface; the gate electrode stack including a lower portion with exposed side walls;
forming a first oxide layer over:
the exposed side walls of the lower portion of the gate electrode stack; and
the exposed surface of the substrate;
using the gate electrode stack and the first oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack as masks, implanting LDD implants into the substrate adjacent the first oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack;
forming a conformal dielectric layer over the gate electrode stack and the first oxide layer;
patterning the conformal dielectric layer and the underlying portions of the first oxide layer to form:
conformal dielectric spacers; and
L-shaped first oxide layer spacers thereunder;
forming sacrificial dielectric spacers over the conformal dielectric spacers;
using the gate electrode stack, the conformal dielectric spacers and the sacrificial dielectric spacers as masks, implanting source/drain implants adjacent the sacrificial dielectric spacers; and
removing the sacrificial dielectric spacers.
11. The method of claim 10 , wherein the first oxide layer is comprised of thermal silicon oxide; the conformal dielectric layer is comprised of nitride or silicon nitride; and the sacrificial dielectric spacers are comprised CVD oxide or CVD silicon oxide.
12. The method of claim 10 , wherein the conformal dielectric spacers have a base width of from about 150 to 500 Å and the sacrificial dielectric spacers have a base width of from about 80 to 300 Å.
13. The method of claim 10 , wherein the LDD implants are formed within the substrate to a depth of from about 500 to 2000 Å using ions selected from the group consisting of BF2, P and As; and the source/drain implants are formed within the substrate to a depth of from about 500 to 2000 Å using ions selected from the group consisting of BF2, P and As.
14. A method of forming a semiconductor device, comprising the sequential steps of:
providing a silicon substrate having a gate electrode stack formed thereover; the silicon substrate having an exposed surface; the gate electrode stack including a lower portion with exposed side walls;
forming a thermal oxide layer over:
the exposed side walls of the lower portion of the gate electrode stack; and
the exposed surface of the silicon substrate;
using the gate electrode stack and the thermal oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack as masks, implanting LDD implants into the silicon substrate adjacent the thermal oxide layer over the exposed sidewalls of the lower portion of the gate electrode stack;
forming a conformal dielectric layer over the gate electrode stack and the thermal oxide layer; the conformal dielectric layer being comprised of nitride or silicon nitride;
patterning the conformal dielectric layer and the underlying portions of the thermal oxide layer to form:
conformal dielectric spacers; and
L-shaped thermal oxide layer spacers thereunder;
forming sacrificial dielectric spacers over the conformal dielectric spacers; the sacrificial dielectric spacers being comprised CVD oxide or CVD silicon oxide
using the gate electrode stack, the conformal dielectric spacers and the sacrificial dielectric spacers as masks, implanting source/drain implants adjacent the sacrificial dielectric spacers; and
removing the sacrificial dielectric spacers.
15. The method of claim 14 , wherein the conformal dielectric layer is comprised of silicon nitride; and the sacrificial dielectric spacers are comprised CVD silicon oxide.
16. The method of claim 14 , wherein the conformal dielectric spacers have a base width of from about 150 to 500 Å and the sacrificial dielectric spacers have a base width of from about 80 to 300 Å.
17. The method of claim 14 , wherein the LDD implants are formed within the silicon substrate to a depth of from about 500 to 2000 Å using ions selected from the group consisting of BF2, P and As; and the source/drain implants are formed within the silicon substrate to a depth of from about 500 to 2000 Å using ions selected from the group consisting of BF2, P and As.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW90112340 | 2001-05-23 | ||
TW90112340 | 2001-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020177284A1 true US20020177284A1 (en) | 2002-11-28 |
Family
ID=21678314
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/154,281 Abandoned US20020177284A1 (en) | 2001-05-23 | 2002-05-23 | Method of using sacrificial spacers to reduce short channel effect |
Country Status (2)
Country | Link |
---|---|
US (1) | US20020177284A1 (en) |
DE (1) | DE10222867B4 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060148269A1 (en) * | 2004-02-27 | 2006-07-06 | Micron Technology, Inc. | Semiconductor devices and methods for depositing a dielectric film |
US20070122988A1 (en) * | 2005-11-29 | 2007-05-31 | International Business Machines Corporation | Methods of forming semiconductor devices using embedded l-shape spacers |
KR101226077B1 (en) | 2007-11-27 | 2013-01-24 | 삼성전자주식회사 | Method of forming a sidewall spacer and method of manufacturing a semiconductor device using the same |
US20140099751A1 (en) * | 2012-10-08 | 2014-04-10 | United Microelectronics Corp. | Method for forming doping region and method for forming mos |
US20170194455A1 (en) * | 2015-12-31 | 2017-07-06 | Taiwan Semiconductor Manufacturing Company Ltd. | Spacer structure and manufacturing method thereof |
US11362098B2 (en) * | 2019-11-20 | 2022-06-14 | Winbond Electronics Corp. | Method for manufacturing memory device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5153145A (en) * | 1989-10-17 | 1992-10-06 | At&T Bell Laboratories | Fet with gate spacer |
US5783475A (en) * | 1995-11-13 | 1998-07-21 | Motorola, Inc. | Method of forming a spacer |
US5856227A (en) * | 1997-05-01 | 1999-01-05 | Taiwan Semiconductor Manufacturing Company, Ltd. | Method of fabricating a narrow polycide gate structure on an ultra-thin gate insulator layer |
-
2002
- 2002-05-23 DE DE10222867A patent/DE10222867B4/en not_active Expired - Fee Related
- 2002-05-23 US US10/154,281 patent/US20020177284A1/en not_active Abandoned
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060148269A1 (en) * | 2004-02-27 | 2006-07-06 | Micron Technology, Inc. | Semiconductor devices and methods for depositing a dielectric film |
US20070122988A1 (en) * | 2005-11-29 | 2007-05-31 | International Business Machines Corporation | Methods of forming semiconductor devices using embedded l-shape spacers |
US7759206B2 (en) * | 2005-11-29 | 2010-07-20 | International Business Machines Corporation | Methods of forming semiconductor devices using embedded L-shape spacers |
KR101226077B1 (en) | 2007-11-27 | 2013-01-24 | 삼성전자주식회사 | Method of forming a sidewall spacer and method of manufacturing a semiconductor device using the same |
US20140099751A1 (en) * | 2012-10-08 | 2014-04-10 | United Microelectronics Corp. | Method for forming doping region and method for forming mos |
US9209344B2 (en) * | 2012-10-08 | 2015-12-08 | United Microelectronics Corp. | Method for forming doping region and method for forming MOS |
US20170194455A1 (en) * | 2015-12-31 | 2017-07-06 | Taiwan Semiconductor Manufacturing Company Ltd. | Spacer structure and manufacturing method thereof |
US10868141B2 (en) * | 2015-12-31 | 2020-12-15 | Taiwan Semiconductor Manufacturing Company Ltd. | Spacer structure and manufacturing method thereof |
US10937891B2 (en) | 2015-12-31 | 2021-03-02 | Taiwan Semiconductor Manufacturing Company Ltd. | Spacer structure and manufacturing method thereof |
US11362098B2 (en) * | 2019-11-20 | 2022-06-14 | Winbond Electronics Corp. | Method for manufacturing memory device |
Also Published As
Publication number | Publication date |
---|---|
DE10222867B4 (en) | 2009-01-22 |
DE10222867A1 (en) | 2003-01-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8058120B2 (en) | Integration scheme for strained source/drain CMOS using oxide hard mask | |
US7384850B2 (en) | Methods of forming complementary metal oxide semiconductor (CMOS) transistors having three-dimensional channel regions therein | |
US7052946B2 (en) | Method for selectively stressing MOSFETs to improve charge carrier mobility | |
US7037794B2 (en) | Raised STI process for multiple gate ox and sidewall protection on strained Si/SGOI structure with elevated source/drain | |
KR100282452B1 (en) | Semiconductor device and method for fabricating the same | |
US7867860B2 (en) | Strained channel transistor formation | |
US7355233B2 (en) | Apparatus and method for multiple-gate semiconductor device with angled sidewalls | |
US6468877B1 (en) | Method to form an air-gap under the edges of a gate electrode by using disposable spacer/liner | |
US7981750B2 (en) | Methods of fabrication of channel-stressed semiconductor devices | |
US6482724B1 (en) | Integrated circuit asymmetric transistors | |
US6403485B1 (en) | Method to form a low parasitic capacitance pseudo-SOI CMOS device | |
US7384833B2 (en) | Stress liner for integrated circuits | |
US7981784B2 (en) | Methods of manufacturing a semiconductor device | |
US20070278589A1 (en) | Semiconductor device and fabrication method thereof | |
US6326272B1 (en) | Method for forming self-aligned elevated transistor | |
US6117715A (en) | Methods of fabricating integrated circuit field effect transistors by performing multiple implants prior to forming the gate insulating layer thereof | |
CN108878361B (en) | Semiconductor device and method for manufacturing the same | |
US20020177284A1 (en) | Method of using sacrificial spacers to reduce short channel effect | |
KR100695868B1 (en) | Isolation Layer and Method of manufacturing using the same, apparatus for a Semiconductor device having the Isolation Layer and Method of manufacturing using the same | |
US7217625B2 (en) | Method of fabricating a semiconductor device having a shallow source/drain region | |
US20090261429A1 (en) | Transistor and method for manufacturing thereof | |
US7521767B2 (en) | MOS transistor in a semiconductor device | |
US7259053B2 (en) | Methods for forming a device isolation structure in a semiconductor device | |
US7435669B2 (en) | Method of fabricating transistor in semiconductor device | |
US6987049B2 (en) | Semiconductor transistors and methods of fabricating the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: PROMOS TECHNOLOGIES, TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HUANG, JIAN-XIAN;REEL/FRAME:012940/0276 Effective date: 20020522 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |